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CVE-2021-21893 : Security Advisory and Response

Discover the impact of CVE-2021-21893, a use-after-free vulnerability in Foxit Reader 11.0.0.49893, allowing arbitrary code execution. Learn the technical details and mitigation steps.

A detailed overview of CVE-2021-21893, a use-after-free vulnerability in Foxit Software’s PDF Reader version 11.0.0.49893, which can lead to arbitrary code execution.

Understanding CVE-2021-21893

This section provides insights into the nature of the vulnerability and its potential impact.

What is CVE-2021-21893?

The CVE-2021-21893 is a use-after-free vulnerability found in the JavaScript engine of Foxit Software’s PDF Reader version 11.0.0.49893. Attackers can exploit this flaw by triggering the reuse of previously freed memory using a specially crafted PDF document. This exploitation can result in arbitrary code execution. Users must be tricked into opening a malicious file or visiting a crafted, malicious site with the browser plugin extension enabled.

The Impact of CVE-2021-21893

The vulnerability has a base severity of 'High' with a CVSS base score of 8.8. It poses a significant risk to confidentiality, integrity, and availability if exploited.

Technical Details of CVE-2021-21893

Explore the specific technical aspects of the CVE-2021-21893 vulnerability.

Vulnerability Description

The use-after-free vulnerability in Foxit Reader allows attackers to execute arbitrary code by manipulating memory reuse triggered by a crafted PDF file.

Affected Systems and Versions

Foxit Reader version 11.0.0.49893 is confirmed to be affected by this vulnerability.

Exploitation Mechanism

Exploitation of CVE-2021-21893 requires users to interact with a malicious PDF document or visit a specially crafted website while having the browser plugin extension enabled.

Mitigation and Prevention

Learn how to protect your systems from CVE-2021-21893 and prevent potential exploitation.

Immediate Steps to Take

To mitigate the risk, users should refrain from opening unfamiliar PDF files or visiting suspicious websites. Consider disabling browser plugin extensions as an additional security measure.

Long-Term Security Practices

Implementing regular security updates, maintaining up-to-date antivirus software, and educating users on safe browsing practices are crucial for long-term security.

Patching and Updates

Stay informed about security patches released by Foxit Software and apply updates promptly to address CVE-2021-21893 and other vulnerabilities.

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